Most plant meristems are located at the tips of shoots and roots and in cylindrical layers within stems and roots. What could happen if they were present in leaves?

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Welwitschia does have a
meristematic base to its leaves. These leaves grow indefinitely,
becoming tattered and worn at the tips as they grow. Presumably
this might occur with any leaves if they had meristems. Petiole
size might also be affected, because increase in the size of leaf
blades would require greater support, and so forth, at the
base.